I thought they were Ford based size. I have wrenches that my Dad used in his repair shop in the 40s/50s
There's one in my Dad's toolbox. His Uncle worked for the EZ Washer company(Ringer washing machines), and his father worked for New Process gear. His Grandfather was a Blacksmith and wheelwright. Somewhere in there had to be a 21/32" fastener.
A bolt with w 21/32 head - DUH! In the old days it was very commomn to have bolt head sizes in the 32 and even 64 range. These days, most common useage would probably be an OLD square head Lag Screw, if it is a 12 point socket
In the cheapest of cheap socket sets they will give you all manor of useless sizes in order to say "99 piece socket set" on the cover.
When you round off the head of a 11/16ths bolt, I guareen-damn-tee you that you'll be digging in the tool box for a 21/32s socket to drive onto that rounded bolt head.
No, that's what cheap 17mm sockets are for...l I have a couple early '50s box wrench sets with 21/32 in them, nothing newer and I can't remember ever using it...but I've never been into a pre-1935 engine...
i used to work on old aircraft, they had odd sized bolts by our standard. if you look outside of our hobby it might be real common
Yep, that's the 99th piece in a 99 piece socket set. You don't see that stuff much any more but you used to see it a lot in the 50's and 60's. I think I had one come with my original tool set I started out with when I started trade school in 1965.
I walked into the local parts house about 1972 and asked for a 21/32 socket. The parts man turned to get it and remarked" You must have a Model A". Model A rod nuts.
I worked at a machine tool manufacturer and 21/32" sockets were used on the heads of bolts for tightening the cutter blade bolts. The bolts themselves were proprietary, made by my company. The guys in the shop were convinced they were designed with the 21/32" hex heads so the employees, both their & their customer's employees, didn't steal the sockets.
My Grandad worked at a couple of Ford dealerships in the 30's, and his old tools had both the 19 & 21/32 sizes. Now I know why!
Socket sets of the 1930's had quite a few unusual sizes.I have several early sets by Indestro and Duro and one set has 17/32;19/32;21/32;25/32;and 31/32. I also have a couple sets of 4 point sockets from that era.There were several types of drives as well.The early socket sets used a ratchet with a female end rather than the more common(now)male end.They also in addition to square drives had several sizes of hex drives with corresponding ratchets.The breaker bars look like large Allen wrenches with a detent ball in the ends.A handle allows it to be turned into a T handle. I have a couple of Snap-On sockets in 17/32 and 19/32 of recent manufacture.I was told that the 19/32 size was for certain GM exhaust manifold bolts.
Been a while, but I remember the fuel flow motive pump on a Boeing 767 having an oddball ?/32 bolt head..
Most commonly used on Air Conditioners. They use 32 type heads on fastners. Also used on Ice machines. I have also seen on T 56 A aircraft engines mostly C 130 A and H models..
I just talked to Dad, and the 19/32 and 21/32 came from his Dad's toolbox from his days at New Process gear building tank transmissions. That Model A rod bolt connection makes me wonder if the Fordson, 9N, 2N, and8N have the same fastener in that application.
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